Alright, let's work through 54213503 times 39859543 step by step
54213503 × 39859543 = 39859543 × (54213503)
+ 39859543 × 3 yielding 119578629
+ 39859543 × 00 which equals 0
+ 39859543 × 500 producing 19929771500
+ 39859543 × 3000 what gives us 119578629000
+ 39859543 × 10000 which equals 398595430000
+ 39859543 × 200000 giving us 7971908600000
+ 39859543 × 4000000 that is equal 159438172000000
+ 39859543 × 50000000 giving us 1992977150000000

= 2160925454009129
